starting combinations:
name: weight, type: 3
name: type, type: 8
name: NULL, type: 0

Removing nonexistent combination:
name: weight, type: 3
name: type, type: 8
name: NULL, type: 0

Removing weight:
name: type, type: 8
name: NULL, type: 0

Removing type and NULL:

Removing nonexistent combination again: